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Iron deficiency anemia  causing blue skin under the eyes. If there is a shortage of iron in the body, oxygen cannot be properly transported by the blood. Hemoglobin is the oxygen transporting component in the blood, moving oxygen from the lungs to the cells where it is released for normal cell metabolism.
An iron deficiency is caused by a decrease in red blood cells. People can acquire an iron deficiency from a poor diet that is low in iron-enriched food, from poor absorption of iron, or from major blood loss. Iron deficiency can cause a painful, red and shiny tongue, which may manifest in a burning sensation.